"Due to recently disclosed security vulnerabilities for nearly all computers, you should disable any JavaScript cookie manipulation on your website (e.g. when using the critical CSS technique) by setting your cookies to be SameSite and HttpOnly on the server, as recommended on the Chromium wiki. Otherwise, sensitive data, like session keys, may be exposed to malicious third parties."

The next time you get something done with DevTools, ask yourself if it makes sense to automate it, and how much time this will save down-the-line.

"The Critical Rendering Path Optimization is a process of improvement and measurement that requires a clear understanding of every task the browser performs to convert code into pixels and so to render a page on the screen. You can learn more about Critical Rendering Path in Google’s optimization guide."

Critical extracts & inlines critical-path (above-the-fold) CSS from HTML